[narrator] Previously on Star Trek: Discovery:
[Stamets] Something has been happening to me.
[Tilly] Have you told Dr. Culber about this?
[Stamets] That would put Hugh in an impossible position.
It would be his duty to report the effects of my genetic manipulation.
On the other hand, Starfleet finds out, his career would be ruined.
Either way, I hurt him.
Nobody survives Klingon torture for seven months.
-What are you doing here? -Captain of this ship,
she's taken a liking to me.
-We can get to your ship undetected? -L'Rell.
[growls]
-[yells] -[electricity sizzles]
Kol has managed to revive the Klingon Ship of the Dead,
and is now sharing its stealth technology.
That makes your mission at Pahvo Starfleet's highest priority.
[Burnham] We landed on Pahvo. We located a transmitter
that could allow Starfleet to detect the presence
of cloaked Klingon vessels.
[Burnham] Like you, we seek harmony.
With your help, and our technology, we can put an end to this conflict.
[Lorca] The transmitter's now sending out a new signal
limited to two subspace bands: ours and the Klingons'.
Captain, long-range sensors have detected an incoming Klingon vessel.
-Can you identify what it is? -The Ship of the Dead, sir.
[Burnham] Pahvans have no means to protect themselves.
We're the Pahvans' only line of defense.
We have ordered all active starships back behind Federation lines.
-Retreat, Captain. That is an order. -With the Ship of the Dead
-on the way here? -Yes.
Kol's next strategic move will be to destroy the transmitter,
thus eliminating any chance of the Federation gaining an upper hand.
But we cannot risk losing the Discovery over this.
[Lorca] Need I remind you, the Klingons don't take threats lightly?
By seeming to align themselves with us, the Pahvans just became one.
That ship can and will destroy an entire planet in the blink of an eye.
Your mission to Pahvo was to give us the advantage
we sorely needed, but that mission failed.
We have gathered the top scientific minds to devise a solution
to crack the invisibility screens that cloak the Klingon warships
within the safety of Federation space. Your crew is to join the effort.
You want me to run from a fight...
and leave a peaceful species to face annihilation.
I'm sorry, but the logic is clear.
You will jump to Starbase 46.
Immediately.
Lieutenant Detmer. Set a course for Starbase 46.
Warp five.
Yes, Captain.
Sir, the Pahvans are more vulnerable
than Admiral Terral could possibly understand. Please.
If I could only speak with him and relay my experience
with their peace-loving species.
At this speed, they'll be expecting us in three hours at Starbase 46.
That's why we're warping and not using the spore drive.
I have no intention of reaching our destination.
But if you're planning on disobeying a direct order,
best not to advertise the fact. So, you all heard the panicked admiral.
Starfleet is tired of fighting the Klingon cloaking devices and losing.
So am I.
We have just under three hours to find a solution.
If we can, we jump back, defend Pahvo.
If we can't...
Let's get to it.
-[indistinct chatter] -Lieutenant Stamets.
I'm gonna need some reasonable explanation for Starfleet
as to why we're currently not using the spore drive.
I understand you've had some trouble with your interface upgrades.
Now that you mention it, um... has been a little itchy.
Unfortunate. Get down to medical bay. Get a full examination.
Is...? Is that completely necessary, sir?
It's obligatory. I want Dr. Culber to run every single test possible.
We need the data trail.
[theme music playing]
Two hours before we arrive at the starbase. Less than that
before the Klingons arrive at Pahvo. Tell me you have a solution.
[Burnham] We suspect the Klingon cloak generates a massive gravitational field,
one that bends light and other electromagnetic waves around the ship.
Essentially rendering it undetectable to our sensors.
But the cloak has small imperfections.
So what appears like background EM radiation
actually contains near-imperceptible shifts
that correlate to the cloak's gravitational field.
If we can determine the exact relationship between the two,
we could develop an algorithm to expose any invisible ship's position.
The imperfections are infinitesimal. How do we detect them?
By placing sensors onboard the Klingon ship
-to relay data back to Discovery. -On the ship?
With a boarding party? One that has to physically beam over?
All right. How do we get our people there?
The Klingons know that Discovery is a valuable target.
We use it as bait to draw their flagship away from Pahvo.
They'd have to drop the cloak to engage us in battle.
[Burnham] Shields and weapons are offline when invisible.
Gives us a small window to beam over after the cloak is down,
-but before their shields go up. -[Saru] The team on the Klingon ship
will install two sensors. Every time it cloaks, we gather readings.
There is a problem, though, sir. It'll take time to gather sufficient data.
How much time?
Days.
Well, we don't have days.
But we do have a spore drive.
Gentlemen...
Starfleet brass is awaiting a full report on the lieutenant's condition.
Well, you wanted evidence of an issue with your navigator?
You've gotten more than you've asked for.
Lieutenant Stamets' scans show a restructuring of the tracts
within the white matter of his medial temporal lobe.
Have you experienced any side effects as a consequence of that?
-No, Captain. -Okay.
I'm not ready to play roulette with his brain.
Duly noted, doctor. Send the report directly to me.
-Captain-- -To me, doctor, and I shall read it.
Lieutenant, follow me.
You want me to make 133 jumps?
Micro-jumps. Each one performed in rapid succession
will provide a three-dimensional snapshot of the cloaked Klingon ship's position.
The readings will be received from every necessary vector in under four minutes.
That will give us the data to calculate the algorithm, but...
it'll take time to compute something that complex.
I have faith in Mr. Saru.
Captain, there has to be another way.
-You-- -I wish there were.
I wish I didn't have to ask you to make this sacrifice,
but the Klingons won't stop until they've destroyed everything, everyone.
And we can't stop them... without the spore drive.
Without you.
But you're asking us to use the drive in ways we've never conceived of.
The spore-delivery system isn't configured
to handle the amount of volume that would be required.
And that's gonna stop you?
I don't think so.
I know what drives you, Lieutenant.
You're not just a scientist, you're an explorer.
You could've stayed in a lab on Earth.
But you chose to go where no one has gone before.
Let me show you something.
You've been accumulating this data from my jumps the whole time?
Mm-hm.
And these scattered pockets of negative mass. It's...
They could indicate alternative parallel universes
connected to the mycelial network.
And with more jumps, we could find a pattern,
perhaps even the coordinates to reach them.
You showed me this invention could take us to places...
that we never dreamed we could reach.
Places far beyond our preconceptions of time and space.
Captain, I didn't know you cared.
We have to win this war.
But then...
Then the journey continues.
If we can save Pahvo, defeat the Klingons, and do all this...
133 jumps it is.
Lieutenant Tyler, prep a boarding party for the Klingon ship.
Two people, in and out.
I recommend Specialist Burnham accompany me, sir.
Out of the question. It's too dangerous.
The effectiveness of our sensors depends on their placement
at the points closest to the Klingon vessel's stern and bow.
But their bridge is four times the size of any Federation ship.
I've been there. Only one location will work.
Lieutenant Tyler doesn't know how to access it. I do.
Then you'll tell someone else where it is.
You're not going. [clears throat]
Sir, you offered me a place on this ship--
And now I'm ordering you to stay.
-That understood? -[Burnham] You are the captain.
But you are not using the full resources to ensure the success of your mission.
There is no logic to your thinking.
Unless this is about me.
I'm here on borrowed time.
When you asked me to stay, it was to help you win this war.
Given the time I spent on that Klingon vessel,
I'm the most qualified crew member to place those sensors.
Otherwise, I have no purpose here.
Fine. Execute the mission as ordered, and get back here safely.
Thank you, Captain.
I know better than to ask you not to do this.
But I will ask you to allow me to take precautions.
I'm so glad he finally told you about the side effects.
-[Culber] Side effects? -Oh, my God.
-I'm sorry. I just assumed-- -No, it's okay, Tilly.
I'm sure the lieutenant has a good explanation
-for keeping that a secret. -Hugh--
There's no time.
This cuff will let me treat you while you're in the chamber.
[mouthing]
[Lorca over comm] We are about to face the most difficult challenge
we have ever attempted.
Today, we stare down the bow of the Ship of the Dead.
The very same ship that took thousands of our own
at the Battle of the Binary Stars.
When I took command of this vessel,
you were a crew of polite scientists.
Now, I look at you, and you are fierce warriors all.
No other Federation vessel would have a chance of pulling this off.
Just us.
Because mark my words, you will look back proudly,
and tell the world you were there the day the U.S.S. Discovery
saved Pahvo and ended the Klingon war.
Sir, long-range sensors have detected the power signature
of a cloaked Klingon vessel entering Pahvo's orbit.
-Transporter room, stand by. -[Lorca] Black alert.
-[computer] Black alert. -Let's jump back to Pahvo.
[male in Klingon] My Lord. It's the U.S.S. Discovery.
They've appeared in orbit around Pahvo.
Their weapons are online.
So...
Starfleet sends their most prized, enchanted vessel to defend the planet...
alone.
The humans are fools.
Prepare to drop cloak and fire.
We will storm her decks...
execute her crew...
and take her storied weapon for our own.
We will destroy this hideous planet Pahvo and its transmitter.
This war will be ours!
[Klingons shout in unison] This war will be ours!
[man over comm] Astrometrics to bridge. Requesting sensor priority...
[Tyler] These pattern simulators will mask our human life signs.
[man] Locking on.
Got it.
Sir, Lieutenant Tyler and Specialist Burnham
have beamed aboard the Klingon vessel.
Excellent. Detmer, evasive pattern lambda ten.
Let's keep the Klingons engaged so Burnham and Tyler can plant those sensors.
Gonna be a bumpy ride.
[phaser powering up]
-Clear. -Pattern simulators are online.
Our life signs are masked as Klingon.
-First drop point is 600 meters this way. -Let's get moving.
[scanner whirring]
[sensor beeps]
[computer] Uplink to Discovery established.
Which way to the bridge?
Out this door. Down that passage.
[Tyler] One down, one to go.
[beeping]
[male voices chattering in Klingon]
[tricorder beeping]
I'm detecting a human life sign onboard.
None of our intel on Kol pointed to a potential Federation prisoner.
If we have a chance to rescue one of our people, we have to.
Burnham, we can't deviate from the mission.
The life sign isn't far from the bridge. Just on the opposite side.
Might even provide us a location to wait out the jumps.
I have to bring everyone home.
[man speaks Klingon down corridor]
Mm-hm.
[phaser powering up]
You have 60 seconds to crack that, or we proceed to the bridge.
Let me try.
Hi. Spent seven months in a Klingon prison?
[sighs] Admiral.
[Tyler's breath trembling]
[phaser powering up]
[growls]
[in English] It's you.
[Tyler screaming]
[gasps]
Admiral, I'm Specialist Burnham. Can you move?
I can't feel my legs.
Tyler--
[gasping breaths]
[shouts]
[Burnham] Tyler.
Here. I'm here. I'm here.
[Tyler whimpering]
-Here, come on. -[Cornwell] Is he injured?
He was a victim of Klingon torture.
State your mission, Specialist Burnham.
[panting]
Captain Lorca dispatched us to install sensors aboard this ship
so we could break the Klingon cloak.
I've treated patients with PTSD symptoms.
He's in shock. He's not gonna be of any help to you anytime soon.
[whimpers]
-I have to make it to the bridge. -You're leaving me?
I don't have a choice.
Here.
Discovery will beam us out when the time comes.
Tyler, can you hear me?
I'm gonna see this mission through. I meant what I said.
Everybody comes home.
[phaser fire continues]
[in Klingon] Sharper! Anticipate her moves!
[male voices speaking Klingon]
-[chatter in Klingon continues] -[panting]
[computer] Uplink to Discovery established.
[Saru] Captain, the second sensor is online.
Standing by to receive data as soon as the Klingon vessel cloaks.
-Then let's make it happen. Black alert. -[computer] Black alert.
Mr. Rhys, be ready to fire torpedoes when we come out of the jump.
Remember our people are onboard, so just a scratch.
Aye, Captain.
Let's give 'em a little taste of what Discovery is capable of.
[in Klingon] What is it doing?
[in English] What is it doing?
[male voice] My Lord, the Federation ship has vanished without a trace.
[rumbling]
[alarm blaring]
So, this is Discovery's fabled power.
[rumbling]
Cloak us at once.
[Saru] The Ship of the Dead is cloaking.
Right on schedule.
[Saru] The sensors are transmitting the cloaking frequency.
Commence jump sequence.
[Airiam] Engaging spore drive jump in five...
four... three...
-two... -Two...
- one. -I love you.
Go.
Our sensors have begun transmitting the data. Keep it up, Mr. Stamets.
Just finish the jumps and we'll have what we need.
Heart rate is at 182.
-How many jumps do we have left? -Ninety-six more.
[Cornwell, echoing] Tyler, you need to focus on my voice.
You're safe.
Burnham will return shortly.
What you are experiencing are the effects of past trauma.
I know it doesn't feel like that, believe me.
What you're seeing is just a memory.
-You are right here with me. -Make them stop. Make them st--
They didn't break you then,
so they are not gonna break you now.
-Normal breath in, slow breath out. -[taking breath]
[Tyler whimpers]
-[inhales deeply] -Good. Keep that up.
-[grunting] -[Tilly] Jump 59.
-Jump 60. -[groans]
Jump 61.
Jump 62.
[computer beeping rapidly]
How we doing, Lieutenant?
There's a clearing in the forest.
That's how they go.
[Tilly] Jump 63.
Engineering to bridge. We have to abort.
We have 70 jumps left, doctor.
[Culber] His sinoatrial node is firing at over 200 per minute.
Call it off now.
Do what you have to. Keep him alive till he finishes the jumps.
-Trillions of lives are at stake. -[Tilly] Jump 64.
That's an order, doctor.
[Culber] Administering digoxin.
Two-point-four cc's.
I love you, too.
[Tilly] Jump 65.
My Lord, sentry reports signs of possible sabotage.
Sector 37, near the burial chamber.
L'Rell.
She must have escaped.
Find her, and cut off her legs.
She will be dealt with after we leave this place.
Engage the warp drive.
[Klingon 1] My Lord?
[Kol] This display from the Starfleet ship is part of a ruse,
and I do not intend to let myself be fooled.
Engage the warp drive.
[Klingon 2] Intruder alert!
-General Kol, I wish to talk. -[communicator translates into Klingon]
Who is that?
You speak Klingon? Show yourself.
-This device is a universal translator. -[communicator translates]
An example of human ingenuity.
All I see is another attempt by humanity
to rob us of our identity.
It's proof of our desire to communicate.
Is that why you're here on my ship, Starfleet intruder?
You are Kol.
You took T'Kuvma's place.
[Kol grunts]
And have you come here to take the place
of the human that this belongs to?
I see that it holds value to you.
Well, it makes for a useful object to pick my teeth.
-I thought Klingons were honorable. -As if you understand honor.
Where is the honor of taking a ship that doesn't belong to you?
[growls]
You had no hand in the battle that caused this war.
You were not here when T'Kuvma fell.
And how would you know such things?
Because I was here. I'm the one who killed T'Kuvma.
-[voices in Klingon outside] -[thudding]
Lieutenant, we're about to have company.
Tyler. There's only so much I can do when I can't move my legs.
[phaser powers up]
[yells]
For the love of God, get up.
Burnham is in danger and she needs your help.
You killed T'Kuvma?
[Kol grunts]
Then this belonged to your captain.
[Burnham] Her name was Captain Philippa Georgiou.
I regret that my actions that day have locked our people into this war.
While I thank you for it.
My rise to power would not be possible if not for the assassination of T'Kuvma.
Lock her up.
Once I return with the slayer of their messiah,
what remains of T'Kuvma's torch-bearing fools
will have no choice but to fall in line.
If you are to capture me, then prove your worth.
T'Kuvma defeated the woman whom that belonged to.
Do me the same honor.
[laughing]
[growls]
I accept your challenge, human.
[grunting and shouting]
[Klingons laughing]
-[shouts] -[Klingon] Kill her! Now!
[panting]
[Tilly] Three...
two...
one.
Jump protocol complete.
Number One, how's that algorithm coming?
Computer estimates five minutes until data analysis is complete
-and we can break through the cloak. -We're sitting ducks.
Captain, I suggest jumping to safety until the cloak has been penetrated.
Why aren't they firing?
They're thinking of leaving. I would.
We're not going anywhere until we have Burnham and Tyler back.
[grunting and shouting]
-[yells, grunting] -[Klingons chanting] Kol! Kol! Kol!
[grunting]
Your death will secure my place
as absolute ruler of the Klingon Empire.
-[growling, shouting] -[Klingons shouting] Kill her!
-[shouts] -[yells]
Captain, I've got it. Algorithm is ready. We have their cloaking signature.
Transferring to transporter room control.
Bring them home, Number One.
Locking on. Discovery to Tyler. Ready to transport.
Tyler to Discovery. I have two to transport. Burnham's on the bridge.
-Confirmed. We'll pull you in first. -[Tyler] Gonna get you out of here.
[L'Rell grunts]
Is victory to be mine so easily?
[grunting]
[man] Specialist Burnham, prepare to transport.
No, it's not.
-[grunts] -And neither is this.
[yells]
Sir, Lieutenant Tyler and Specialist Burnham
are safely back aboard, along with Admiral Cornwell,
who's been injured, and a Klingon prisoner
-who's been taken into custody. -Extra prize.
All right. Load all available photon torpedoes.
-Target the enemy ship. -Target acquired, sir.
-We can see them. -[grunts]
And fire.
[Kol screaming]
Admiral Cornwell's emergency medical shuttle
has successfully arrived at Starbase 88.
She is currently undergoing surgery.
I'm told she should make a total recovery.
Excellent news. Make sure to send her my best.
The planet of Pahvo is safe, the cloak-breaking algorithm
is being refined for fleet-wide use as we speak,
and will be transmitted on a secure channel to you
in just under 11 hours.
The sooner, the better.
There are reports of cloaked Klingon vessels
advancing on our borders, and on you.
The war is not won yet,
but you have increased the likelihood of a victory for Starfleet,
-d espite your... unorthodox methods. -I'm gonna take that as a compliment.
Now it is time for Discovery to return to safety.
Report to Starbase 46.
You will find that your accomplishments have not gone unnoticed.
Starfleet Command would like to award you with the Legion of Honor.
I look forward to congratulating you in person.
[computer] Transmission ended.
[man over comm] Cadet Decker, please report to the ready room.
[door beeps]
[Tyler sighs]
-Looks like you cleaned up nicely. -Dr. Culber.
You want to come in?
[sighs]
It's gone. The Ship of the Dead.
The planet of Pahvo is safe.
We did that.
No. You did that.
So, thank you for not giving up on me back there.
I need to know something.
You put on a facade.
Like everything that's happened to you just washes off.
I actually envied that about you.
But when you saw that Klingon...
Who is she to you?
I think you already know.
You were her prisoner.
Yeah.
Her name's L'Rell.
She's the reason I've had nightmares...
every night since Captain Lorca and I fled her ship.
She's also the only reason I'm still alive.
Two hundred and twenty-seven days.
But it only took one to realize I wasn't gonna make it out alive,
not unless I made a choice.
What did you do?
I survived.
That... That Klingon...
was more than just my captor.
She was my torturer.
One who took a particular...
interest in me.
And I saw a way out.
A way to live past day one, day ten, day 20, day 97...
I encouraged it.
Her sick affections. Her obsession with me.
Because if I hadn't, I'd be dead, like all the others.
And I got out.
I get to keep living my life.
But the thing is...
if none of that had happened, I wouldn't be here.
On this ship. With you.
And that almost makes it... worth it.
Is that weird?
No.
I'm glad you're here, too.
[Tyler sniffles]
You get to live your life, the way you deserve to.
Not at war...
but at peace.
I found peace.
Right here.
[Lorca] They wanted to give me a medal for leading the mission,
saving Pahvo, if you can believe the irony.
-I told them to give it to you. -That's, um...
not necessary, sir.
[Lorca] You made the jumps. You risked everything.
None of it would've been possible without you.
You did it so well,
the Klingons are on their way, hell-bent on revenge.
Wish we could stay and fight.
But Starfleet wants us back at Starbase 46.
-Do you need me to jump? -No, I'd never ask that of you.
You've done enough. We'll warp to Starbase 46. We'll be fine.
But the Klingons. I'll do one more jump to get the crew back to safety.
They've risked enough already.
If you're sure.
Thank you.
We're gonna win this war on account of you, Mr. Stamets.
After this, it's a whole new chapter for Discovery.
You've opened a door to a whole new era of exploration.
The data provided by the micro-jumps
will push us closer than we've ever been
to understanding the mysteries of the universe.
No, Captain, I mean only one more jump.
After we get back, I'm done.
Traveling the mycelial network
is like commingling with the most abstruse blips
of our celestial existence.
I've seen these stars through a lens no one else has access to,
and that has to be enough for me.
Because I need Starfleet's best doctors to examine my condition
and figure out what's been happening to me.
One last jump, then.
You've served the Federation honorably, Lieutenant.
Well, I'll always have you to thank for the view.
[chuckles]
You ready?
[Tyler panting]
[L'Rell growling]
[Tyler whimpers]
-[Tyler gasps] -[L'Rell shouts, growls]
[L'Rell screams]
[L'Rell hissing]
[L'Rell shouts]
[gasping, panting]
[Tyler shrieks]
[panting] What did you do to me?
Do not worry.
I will never let them hurt you.
[alarm wailing]
[computer] Command stations.
- Command stations. -Soon.
Mr. Stamets?
- Shall we dock this weary vessel? -Yes, Captain.
There is a moon near Starbase 46,
and I understand they have the most esteemed Kasseelian opera house,
where they are currently performing La Bohéme.
I could be your date.
You saying you'll actually sit through that with me?
Just this jump.
And then I'm going to have a lot of free time on my hands.
Let's go home.
[screaming]
[scream echoing]
[overlapping alarms wailing]
-[Lorca] Talk to me, cadet. -The computer is reading it
as an incomplete navigation sequence.
[gasping]
[body thuds]
He's crashing. I'm detecting white matter hyperintensity.
What's wrong with him? What's happening to his eyes?
So many.
I can see them all.
Infinite permutations.
-It's... magnificent. -[Culber] Paul!
-[distant] Paul! -Ship-wide status.
Some structural damage, but all systems are holding.
[alarms continue]
Mr. Saru, what am I looking at?
I... I'm not quite sure.
But I'm unable to confirm our position using standard procedures.
Sensors are going haywire.
Where is our starbase?
Not where it should be.
[Lorca] Is that Klingon wreckage surrounding us?
Captain...
I'm afraid I don't know where we are.
[theme music playing]